Edwaed weston



(No Model.)

B. WESTON.

ELECTRIC INGANDESOENT LAMP.

Patented Dec. 26, 1882.,

PUERS. Phom-Lmmr, wnwn wu, n. c.

UNIT D STATES PATENT OFFICE.

EDYVARD WESTON, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE UNHED STATES ELECTRIC LIGHTING COMPANY, OF NEW YORK, N. Y.

ELECTRIC INCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 269,759, dated December 26, 1882.

Application filed December 13, 1881. Renewed September 13, 1882. (No model.)

To all whom it may concern: lengths of wire are suitably connected to the Beit known that I, EDWARD WESTON, a sub carbons, a small block or bead of lass conject ot' the Queen of Great Britain, and a resitaining a large proportion of metal in its comdent of Newark, in the county ot'Essex and position being first applied to one of the wires.

Statcot' New Jersey, haveinvented certain new The other wire and the carbon are then care- 55 and usefulImprovementsin Electric Incandesfully introduced into the globe until the bead cent Lamps, otwhich the followingis aspecitiof metallic glass on the conductor enters one cation, reference being had to the accompanyof the tubes above described. By the applica ing drawings. tion of the heat of an ordinary blow-pipe the [0 My invention comprises a novel method of tube is then welded to the block, and one wire 60 manufacturingelectricincandescentlamps,the is thus effectually and permanently sealed. main features of which relate to the character The other wire may then be sealed in by turnof the carbon employed and the method of ing the tube through which it should project scaling the conductors attached thereto into in the flame of a blow-pipe. To facilitate this the case or receiver by which it is inclosed. the tube should be just large enough for the 6 It is desirable, for many reasons,to usestraight free passage of the wire. Just before cooling, filaments of carbon in incandescent lamps, the last-mentioned wire and tube are forced partly from the fact that they are more readily slightly inward, by which means a slight bend and perfectly produced and partly for the reais given to the carbon to provide against any son that the points of-highest potential are at accident that might occur from its expansion 70 the greatest possible distance apart, thus lessunder the high temperature. The second sealening'the tendency of an electrical discharge ing thus formed may be re-ent'orced by a coatwithin the lamp-globe. The extreme delicacy ing of metallic glass applied in any proper of the filaments or conductors and the characmanner, and the projections which the two ter of seal required for the perfect exclusion of sealing-tubes form may then be platinized and 75 air from the globe have prevented the use of electroplated, as explained in another applistraight carbons to any extent. By the plan cation, to form the terminal contacts of the devised by me difiiculties heretofore encounlamp. The lamps completed to this stage are tered in the employment of straight carbons exhausted and sealed in the usual manner.

are overcome and a very simple and efl'ective The drawings accompanying illustrate by 80 lamp produced. figures drawn on a somewhat enlarged scale The lamps are composed of three essential the invention. parts-thecarbons,thesupporting-conductors, Figure 1 is a view of the carbon with the rueand the globe. The carbons are straight nartallic conducting-wire attached. Fig. 2 is a 5 row ribbons or strips of any proper material, central vertical sect on of the globe; Fig. 3, a 8; thoroughly carbonized and otherwise treated, section showing the first sealing, and Fig. 4 a as is now well understood, to render them casection of the complete lamp. pable of withstandingaprotractedandintense A represents the carbon; C B, the short incandescence. The supporting-conductorsare lengths of wire for supporting the same; D, a

0' made of shortlengths of fineplatinum or other bead of metallic vitreous cement applied to wire, and are flattened or prepared in other one of the wires near its end. F is one of the ways for connection with the ends of the carsealing-tubes, of sutficient diameter to allow bons. The globes are blown or molded in any the introduction of the carbons, and which is proper shape, an oval being preferred, and welded to the bead D. E is the opposite tube,

then shorttubes or teats drawnout from them, made just large enough to contain the con- 95 two of which are diametrically opposite, and ductor B; and G is a tube drawn out from the are used for the introduction and sealing of globe at any convenient point for the, purpose the conductors, while the third is utilized for of exhausting the same. exhausting and sealing the globe. In con- In Fig. ithe lampis shown complete and structing the lamps from these parts the short sealed,and the projections formed bythe tubes too E and F covered with conducting films or coatings H, which, as they adhere'to the wires B (J as well as to the glass surrounding them, form convenient terminals.

Having now described my invention and the best manner of which I am awarein which the same is or may be carried out, what I claim as new,anddesireto secure byLettersPatent,is-

1. The method of sealing the wires of an incandescent lamp containing a straight carbon, which consists in applying to one of the wires a vitreous head or block and uniting them to the carbon, then passing them through sealing-apertures in a globe and securing them by welding the globe to the vitreous head on one wire and sealing the other wire directly into the glass, as set forth.

2. The combination, with a globehaving diametrically opposite sealing apertures, of a straight carbon, conducting-wires, and a head or block of vitreous material attached to one of said wires and welded to the glass, substantially as set forth.

3. An electricincandescentlainp containing a normally-straight strip of carbon, held by the supporting-coinluctors in a slightly bowed or hentcondit ion,as and for the purpose set forth. 4. The method of sealing the metallic wires in a lamp, consisting in welding the glassforniing the globe to the same and re-enforcing the joint thus formed by a mass of metallic vitreous cement.

EDWARD WESTON. Witnesses:

PARKER W. PAGE, W. FRISBY. 

